20926887 has 16 divisors (see below), whose sum is σ = 28615680. Its totient is φ = 13598912.

The previous prime is 20926883. The next prime is 20926889. The reversal of 20926887 is 78862902.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20926887 - 2² = 20926883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20926883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23818 + ... + 24680.

It is an arithmetic number, because the mean of its divisors is an integer number (1788480).

Almost surely, 2^20926887 is an apocalyptic number.

20926887 is a deficient number, since it is larger than the sum of its proper divisors (7688793).

20926887 is a wasteful number, since it uses less digits than its factorization.

20926887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 20926887 is about 4574.5914571686. The cubic root of 20926887 is about 275.5718656220.

The spelling of 20926887 in words is "twenty million, nine hundred twenty-six thousand, eight hundred eighty-seven".